A 6.6-magnitude earthquake struck off the west coast of Indonesia's Sumatra on Friday. The United States Geological Survey said the shallow quake hit at 12:30 near the island of Nias, about 250 ...

For example, a substantial gap lies between the rupture zone of the 2005 Nias earthquake and the section of subduction thrust that broke in the 2007 sequence. To fully understand such earthquake ...